Motor head



Nov. 20 '1923. 1,474,511 CHEVROLET v MOTOR HEAD Filed March 1a. wl

ATTORNEYS.

Patented Nov. zo, i923. Y f

matr-an stares einen tartar ortica. y

Louis. oHEvnoLE'r, or INDIANaroLs, nnranaassreivon 'ro CHEVROLETI Bacs.

MANUFACTURING oo., or' innelvnronrs, rNDIANA.'

MOTOR Haan.

Application filed March 18, 1921.y Serial No. 453,224.

To all 'whom t may concern.'

lie it known that I, LoUis CHEVROLET, a citizen ofthe United States. and a resident of Indianapolis, county of 4Marion and State of Indiana, have invented a certain new and useful Motor Head; and l do hereby declare that the following is afull, clear, and exact description thereof, reference heingrhad to the accompanying drawings, in

.which like numerals refer to like parts.

This invention vrelates to a detachable head to replace a detachable head of a multicylinder combustion engine of the Lftype,

wherein the engine is self-governed by the,l

same having restricted valve areas and restricted valve supply passages and transformv the engine into a valvein-the-head type without interference with or from the securing bolt openings in the engine block and whereintheusualvalve pushrod openings are utilized.

The chief object. of this invention is to provide for a multi-cylindered L-type internal combustion engine, a removable head with valves in the same, wherein the normal valve area -is increased wit-hout increasing n the number o f valves` so as to utilize the entire cylinder capacity and the usual cam means for operating the original valves, and

in providing passageshwithin the cylinder head to and from the valves, which are of the same or greater cross sectional Varea as the valves associated therewith.

One 'feature ofthe inventionconsistsin positioning the passages such that the bends or curves thereof are free and smooth,

whereby the gases, both incoming. andv outgoing, will have relatively free passa-ge to and from the valves and to shorten the length4 of the passages betweeny the manifolds or pipesand the valves.

Another feature. of they invention consists in replacing the original detach able-cylinder head oft anL-type motor vwhose,intake andA exhaustv ports are onthe same side, with anl improvedhead with 'itsz intake upon one side andits exhaust. upon the otherI side.

` A further feature of the invent-ion. which is partially` a corollaryof. thaty wherein the gas, passages avoid thefbosses of Vpush rod guides is that, all of said guide bosses are. watencooled, and, of course, the push vrods are never. exposed, tothegases. Y

` stili a. imaginarme ,of lthe invention isk '-1 iterations? f @fthe risllreleliide. @eenings in the head, so that the same will register with the original push rod guideopenings in the engine block, whereby the same Vcam shaft and cam means may be utilized;

with a portion of the head broken away to show in section the passages leading to the y respective valves.l

In the drawings, 10 indicates what may'l be termed the exhaust pipe of an internal combustion engine, and. 11- the intake pipe,

bot-h being suitably connected to the cylin- Y der head. In the present invention -but one opening 12 is provided associatedwith the c intake `ll; while three openings 13 are provided to connecty the cylinder head with the exhaust manifold. 10; Thus, the exhaust opens on one side ofthe cylinder head and lthe intake upon the other which permits the gas iliassages to be increased in area .within the head.` lt is to be understood that thisv .invention is particularly adapted to replace the original cylinder headI on standard L- typemotors, such as the Ford. ,y

The presenty invention, therefore, seeksto increase the valve. area andcor'respondingly increase the connectingpassage as welles to `shorten the length of saidpassages, but these,

intentionsnecessarily are governed andr determined .by the push rods or tappet guides associatedwith gtheengine, and the bolt guides in the engineby which the original cylinder head was detachab-ly secured thereto. rlfherefore, while. it is relatively veasy to increase. the

. valve area. of affdetachable head'to'replaoe the head ofl an L-type motorpskuch as` the Ford motor, it' is` extremely diflcultto increase theA cross sectional. areaA of.. the connecting` passages in a corresponding manner, since said passage` areas necessarilylare tage ofvincreasing. the. valve area hasfbeenlocated 1s-heretoforev explained. lf The advani' Y V a sixteen vvalve head foi an eight-valve,four 1 have provided for a. plural'valveY construction to replace each valve,t`hereby providing cylinder motor.V Heretofore, however, the

increase invalve area failettoY accomplish its purpose, since the passages leading to Y Y in and from thosevalves were,not'correspondingly increased, so'that both the valve passages'and the'valves Were of the proper cross sectional area to fully utilize the capacity of Ythecylinder connected therewith. VAnother diiiiculty which reduced and preventedthe increase inpoiver from being secured, was that if the passages to and from the valves were increased, said passages :were necessarilyjirovided with sharp Vand acute bends Vto avoid push rod and securing bolt bosses which offered obstruction to the free foivof gases to and from the valvesv through said passages.

Thus, heretofore all detachable heads, so far as known, failed to increase v'the valve areaand the passageparea, and de- 1 crease the length Vof theunobstruc-ted passage Ytofully develop theV full 'efiiciency of thel en-.` V'gine; secondly,v to increase the areafof the passages to. and'from-the valves suchthat theV f vsame Was equal to or greater. than the valve area; and thirdly, toVV provide'free, and

smooth passages 'to and'from the valves. Y

' The, present invention obtainsVv the freepassage 'of the'gases through the 'enlarged passages to and from the valvesand utilizes and the same. number of valves (but these Yof'greater area) with which Ythe original L-L' type motor was provided. Thus, the Vsame' Vvalve `operating means may be utilized.

' proper, and, of course', thedetachable cylin-; der head is necessarily'provided with com-VV l-Iovvever, When in a detachable head Vthe aforesaid features aresecur'ed, the saine, as'.

heretoforeV explained, are governed `or determined bythe positioning of the tappet,

guides and thevbolt guides in the cylinder plementary openings. regis-tering therewith.

This invention, therefore, as clearly illustrated inthe drawingprovides a plurality of passages to and fromthe valves, vvliich VYare' relatively straight, or atV leastY are pro-Yy vided with a minimum of bends, and these 50 'stance is provided'witha discharge passagev of smooth'curvature The opening l2' connects with a lpair offpassages 14k and said passages 14 with the opening Al2.is substan-V tfially 1"-shaped, and each branch of the Y- VV*shaped passage is Vadapted. to supplyfuel to j tyvo adjacent valves in tivo adjacent cylinders.k The'extreme end cylinder in each n- 15, Which as shown is relatively straight and of substantially uniform cross section. The

tivo intermediate valves of the two intermediate andy adjacent cylinders.are'connected together by means of an additional V-shaped channel 16. The -.ends Vof said V arms terminate adjacent the valves. Herein thebolt bosses are designated by the numeral 17 and' V It will be noted'K-thatv Whereas' in the standard L-type engine, such as vthe Ford engine,

Vtachable lheadv and a cylinder blockVV pro-V the V*push 'rod'A bosses vare designatedby the numerals 18: vThe outerv Cylinder Wall is designated by thenumera'l 19 andthe vvater jaeketing spaces thereof by the numeral 20;

the cylinder block is provided with' gaspassages which communicate vvithv the cylinders through passages 'in .thedetachable head.

The lpresent invention not only transforms the aforesaid engine Ainto ajvalve-:n-the- Vhead type engine with its-.resultant advantages of having the `valvesgin the :head and the increased mechanical efliciency inV addition thereto, but also eliminates the use of the gas passagesY in the cylinder block, thereby shortening the `length ofY the resultant gas passages, and furthermore, such a transformaten permits the resultant eiigin'e'toVV embody the Vdesirable features ofthe T-type engine, wherein the gasV passage openings.

arepositioned upon oppositesidesofthe en- Vgine Without inco'rpora'tingYthe Vdisadvanfor a Ford cylinder block originallyY'provided'vwithl in; take and exhaust passages uponY the saine side, and valves 'controlling-the Same, adapted to change the same into valve in Vthe 71h05' i head typemotor, 'said'.head having intake and exhaust means upon opposite sides.V f', which do notcommunicatefrvith thejcylinder Vi block intake `and exhaust 'passages,rand provided with the samenumber Voffval-ves originally provided, relatively unobstructed pa'Y sages leading to and from said-valves'asaid e. valves beingjof greater cross lsection"',tlian vthe original. valves, andsaid passagesbeing kof equal or greater'cross section than said in-'f 115 creased 'valves and of Vdecreased len,gtlireby-V .f

reason of said non-communication.

.3. In adetaChabIecylinder headforfa"frVY multi-cylinder L-type motor havingl a devided With vgas Y passages, and registering openingsinboth for the push rods'A and securing bolts, said replacing headv` having registering openingsand having,Y a'pplural Y number of valves percylmder, a.:eo'ininonlw'` V`opening upon one side ofsaid replacingfVY head, anda plurality of openingsupon V.the other-side thereof, a Y passagecommunicating with said single opening and havingk each branch adapted to connect with a pair fao Y' Y ino engine otherwise described Vas Yincluding aYA o ings.

of cylinders, and other passages associated with the plurality of openings and adapted to connect with the other openings of said cylinders, `all of said passages being positioned Within the head to avoid said open- Y-shaped passage associated With the rst mentioned opening and adapted to connect with the out-side valves of two adjacent cylinders, and 'a V-shaped passage adapted to connect With the inside valves of tWe adjacent cylinders and communicating with said second mentioned opening, all of said passages being positioned Within the head to avoid said openings.

5. 1n a detachable cylinder head for a Ford motor otherwise described as a multicylinder L-type motor having a detachable head and a cylinder block provided with intake and exhaust gas passages upon the same side and registering openings in both block and original head for the push rods and securing bolts, said original Ford vdetachable head being provided with intake and exhaust means opening through the cylinder block, said rep lacing head having registerin openings for said push rod and securing olt openings and having intake and exhaust means upon opposite Sides Which do not communicate With the cylinder block intake and exhaust means and provided with the Vsame number of valves with which the cylinder Was provided, relatively unobstructed passages leading to and from said valves, said valves being of greater cross section than the original valves, and said re lacino' head aassaoesbeine of eual or' C) l b greater Cross section than said increased valves and of decreased length by reason o't ing head passages `being positioned Within the head'to avoid said openings.

. 6. In a detachablev cylinder head for a l Ford motor otherwise described as 'a multicylinder L-type motor having a detachable head and a cylinder block provided with in-L take and exhaust gas passages upon the same sideand registering openings in both block and original head for the push rods andsecuring bolts, said original Ford detachable head being provided with intake and exhaust means opening `through the cylinder` block Oas assaofes said re lacing `head.

b t 7 b Vhavin rewisterm o eninofs forv said oush g e e l rod and securing bolt openings and having sides which do not communicate Withthe cylinder block intake and exhaust means in of e ual or greater cross section thanv said increased valves and of decreased length by reason of said non-communication'all of said replacing head passages being positioned Within the'head to avoid said ,openings, said replacing cylinder head being hol-f l'ovv for cooling purposes and push 'rod guides in said replacing head having registering openings for supporting the push rods therein Without exposure to the gases.

In witness whereof, I have hereunto aliixed my signature.

- LOUIS CHEVROLET.

50, said non-communication, all of said replacl Vintake and exhaust means upon opposite 

